Bioshock Infinite - Burial at Sea Launch Trailer

On the eve of Rapture's fall from grace, Elizabeth enlists Booker DeWitt's services in locating a lost girl. Who is this girl Sally, what does Booker know of her supposed fate, and what is Elizabeth's connection to this mysterious child? Find the answers to these questions and more in this new addition to BioShock Infinite, almost entirely from scratch by Irrational Games.